JPS63199980A - Pilot proportional valve - Google Patents

Abstract

PURPOSE:To make heating and cooling performable simultaneously at the time of dehumidification, by installing a pilot proportional valve in space between two room heat exchangers. CONSTITUTION:A second sub-valve seat 22, where a second sub-fluid passage to be interconnected to a main valve chamber 1a is opened, is installed in a sub-valve chamber 1b. And, a first sub-valve body 4 is energized toward a first sub-valve seat 14 by a first spring 3, and also a second sub-valve body 6 is energized toward the second sub-valve body 22 by a second spring 5. In addition, there is provided with a valve driving rod 9 which separates the firs sub-valve body 4 from the first sub-valve seat 14 steplessly according to rotation of a motor. With this constitution, heating or cooling can be made possible to be done simultaneously at the time of dehumidification.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a proportional valve used for controlling the flow rate of refrigerant in a heat pump type air-conditioning device.

Conventional Ibaraki heat pump type air-conditioning systems switch between heating and cooling by reversing the flow direction of the refrigerant, but if dehumidification is also attempted, the indoor heat exchanger must be divided into two parts, one for cooling and one for reheating. Therefore, it is necessary to construct a refrigerant circuit that includes an expander between them.

An improved example of such a refrigerant circuit is disclosed in Japanese Patent Application Laid-Open No. 58-106369 (FIG. 8). In this circuit, an expansion valve f having reversible flow is provided between the outdoor heat exchanger C and the indoor heat exchanger S, and a capillary tube h and a two-way solenoid valve g are provided between the indoor heat exchangers a and b. are set up in parallel. During normal cooling or heating, the solenoid valve g is opened to use both indoor heat exchangers a and b for cooling or heating, and during dehumidification, the solenoid valve g is closed and the indoor heat exchanger is used for heating and indoor heat exchange. Exchanger a is used for cooling. d is a compressor, and e is a four-way valve.

However, as a solenoid valve g in such a circuit,
It needs to be large so as not to obstruct the flow of refrigerant during cooling or heating. Furthermore, since the capillary tube h is used as an expander, it is not possible to control the rise or fall of the room temperature during dehumidification, and if you try to adjust the room temperature at the same time as dehumidification, instead of using the capillary tube, you can use multi-stage control with a small flow rate or It is necessary to use a valve that can be continuously controlled, such as an electrically operated valve.

As mentioned above, when trying to provide some cooling or heating to create a comfortable environment during dehumidification with conventional air conditioners that can perform cooling, heating, and dehumidification, instead of capillary tubes, Large and expensive control valves must be loaded;
Inevitably, a control device for synchronizing the operations of a plurality of control valves becomes complicated, resulting in a problem of increased size and cost.

Therefore, the present invention aims to improve the functionality of a device installed between two indoor heat exchangers to control the flow rate of refrigerant, make it more compact, and at the same time prevent cost increases. Another object of the present invention is to provide a small-sized flow control valve that also functions as an expansion valve and meets the above objectives.

[Structure of the invention]

. The object of the present invention as described above is to provide a main valve seat in which a first main fluid passage is opened at the bottom of the valve chamber, and a first auxiliary fluid passage branched from the first main fluid passage is opened at the top of the valve chamber. a valve body having a first auxiliary valve seat and a second main fluid passage opening on a side wall of the valve chamber; and a valve body that fits into the valve chamber like a piston to divide the valve chamber into a main valve chamber and a auxiliary valve chamber; A main valve body that can close the main valve seat, and is provided with a second sub-valve seat in which a second sub-fluid passage communicating with the main valve chamber opens on the sub-valve chamber side, and a first sub-valve seat that can close the first sub-valve seat. A first sub-valve body that can be biased toward the first sub-valve seat by a first spring provided between the first sub-valve body and a first sub-valve body provided on the main valve body side of the first sub-valve body. A second sub-valve body that can close the second sub-valve seat by a second spring provided between the second sub-valve seat and the first sub-valve body.
One is biased toward the sub-valve seat and has a limited protrusion length from the first sub-valve element, and the other is one in which the first sub-valve element is moved steplessly from the first sub-valve seat in accordance with the rotation of the motor. This is accomplished by a biloft proportional valve comprising a valve drive rod that can be spaced apart.

An example of such a pilot type proportional valve according to the present invention is shown in FIG. 1, in which a cylindrical valve chamber 10 is formed in the valve body 1, and a main valve seat into which a fluid passage A opens is formed on the bottom surface of the valve chamber 10. 12, an opening 13 for a fluid passage B is provided on its side surface, and a first sub-valve seat 14 is provided on its upper surface into which a fluid passage C branched from the fluid passage A opens. A piston-shaped main valve body 2 is provided in the valve chamber 10 so as to be slidable up and down, and divides the valve chamber 10 into a main valve chamber 1a and a sub-valve chamber 1b. The main valve body 2 also has a fluid passage 21 which is open at one end to the main valve chamber 1a.
opens toward the sub-valve chamber 1b side, and a second sub-valve seat 22 is formed.

The upper part of the main valve body 2 is formed into a cylindrical shape, and the first spring 3 is accommodated therein, and the first sub-valve body 4 is provided to compress the first spring 3.

The first sub-valve body 4 itself is formed in a cylindrical shape, and is provided with a needle 41 at a position facing the first sub-valve seat 14.
It constitutes the first pilot valve.

In addition, an inward locking portion 42 is provided at the lower end of the cylinder of the first sub-valve body 4.
is provided so that it can engage with an outward locking portion 61 provided at the upper end of the cylindrical second sub-valve body 6. A second spring 5 is housed inside the cylindrical portion of each of the first sub-valve body 4 and the second sub-valve body 6, and urges the second sub-valve body 6 from the first sub-valve body 4. However, the locking portion 42 and the locking portion 61 are engaged, and the second sub-valve body 6 cannot be separated from the first sub-valve body 4.

Further, the lower surface 62 of the second sub-valve body 6 faces the second sub-valve seat 22 provided on the main valve body 2, and constitutes a second pilot valve.

At the upper part of the valve body 1, there is a guide 7 having a male thread formed on the outer surface.
is planted, and the rotor 81 of the stepping motor 8
are screwed together so that they can rotate and move along the guide 7. 82 is a sealed case surrounding the rotor 81, and 83 is a stator fixed to the outside of the sealed case 82. Further, 84 is a sliding washer provided so as to be in contact with the end surface of the rotor 81, and only the amount of movement of the rotating rotor 81 in the axial direction of the guide 7 is transmitted through the thrust receiver 85 to the valve drive rod 9,
9.

The valve drive rods 9, 9 are slidably provided through the upper wall of the valve body 1, and push down the first sub-valve body 4 in the axial direction of the valve.
Operates to open the first virofft valve. When the rotor 81 reversely rotates and moves upward, the first spring 3 pushes up the first sub-valve body 4 and simultaneously pushes up the valve drive rod 9, so that the first pilot valve closes.

In the pilot type proportional valve of the present invention configured as described above, the valve drive rod 9 protrudes toward the inside of the valve chamber and retracts in accordance with the rotation of the motor 8, and when retracted the most, the first spring The force of 3 causes the main valve body 2 and the first sub-valve body 4 to
are pushed, and both the main valve and the first pilot valve are closed as shown in FIG. In this case, fluid passage A
The fluid flowing from the main valve body 2 to the fluid passage B pushes up the main valve body 2 without compressing the first spring 3, so it can pass even at a large flow rate (Fig. 2). It cannot flow in the direction of (Figure 1).

Next, when the valve drive rod 9 pushes the first sub-valve body 4 in accordance with the rotation of the motor 8, the first pilot valve opens little by little. In this state, the second sub-valve body 6 remains separated from the second sub-valve seat 22, so the fluid flowing in from the fluid passage B pressurizes the main valve chamber 1a and the sub-valve chamber 1b at the same time, so that the main valve does not open. do not have. Therefore, the fluid passes through the second pilot valve from the fluid passage 21, enters the auxiliary valve chamber 1b, and then flows through the first pilot valve and the fluid passage C.
and then toward fluid passage A (Fig. 3). In this state, when the fluid goes from the fluid passage A to the fluid passage B, it can flow through the same path in reverse.

When the valve drive rod 9 further pushes the first sub-valve body 4, the first pilot valve opens further, and the amount of fluid flowing toward the fluid passage C increases in accordance with the degree of opening. In this way, the first sub-valve body 4 is further pushed down by the valve drive rod 9 (and the opening degree of the first pilot valve becomes even larger), but on the other hand, the second sub-valve body 6 is pushed down further by the second sub-valve seat
2, the amount of fluid flowing toward the fluid passage C is limited (FIG. 4). Then, the pressure in the sub-valve chamber 1b begins to decrease, and the difference between the pressure in the main valve chamber 1a applied to the bottom surface of the main valve body 2 and the pressure in the sub-valve chamber 1b applied to the top surface causes the main valve body 2 to It is pushed up against the forces of the spring 3 and the second spring 5. At this time, the second pilot valve is closed, and a large amount of fluid from fluid passage B flows toward fluid passage A through the opened main valve (FIG. 5).

FIG. 6 shows a refrigerant circuit (during cooling/dehumidification) of an air-conditioning system in which the pilot type proportional valve of the present invention is provided between two indoor heat exchangers. The pilot type proportional valve of the present invention is
In addition to this, other devices are shown using the same symbols as in FIG. 8, which shows the prior art. In this refrigerant circuit, FIG. 7 shows the flow rate characteristics of the proportional valve (2) when the expansion valve (f) is opened for dehumidification. In the figure, ■ is the state shown in Figure 1 where the opening of the first pilot valve is 0, which is a state suitable for heating operation with the main valve fully open, and ■ is the state where the opening of the second pilot valve is 0, that is, the first pilot valve is open. This is the state shown in FIG. 5, that is, the state of cooling operation with the main valve fully open. The middle ■ is a state suitable for dehumidifying operation with the main valve closed.

〔Effect of the invention〕

By installing the pilot type proportional valve of the present invention between two indoor heat exchangers of a heat pump type air conditioning system that can perform dehumidification, it is possible to freely perform heating or cooling at the same time as dehumidification. This makes it possible to simplify the refrigerant circuit regardless of the sophistication of its functions. The proportional valve of the present invention has the advantage of being small in size, allowing a large flow of fluid to flow, and being able to construct an economical heating and cooling system.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of an embodiment of the biloft type proportional valve of the present invention, Figs. 2 to 5 are explanatory diagrams showing the operating states thereof, and Fig. 6 is an air conditioning system using the pilot type proportional valve of the present invention. FIG. 7 is a graph showing the flow rate control characteristics of the pilot type proportional valve of the present invention. FIG. 8 is a circuit diagram of a conventional air-conditioning device with a dehumidifying function. 1... Valve body, 2... Main valve body, 3... First spring,
4...First sub-valve body, 5...Second spring, 6...Second
Sub-valve body, 7... Guide, 8... Motor, 9... Valve drive rod, A, B. C...Fluid passage, a, b...Indoor heat exchanger, C...
・Outdoor heat exchanger, d...Compressor, e...Four-way switching valve, f...Expansion valve, g...Solenoid two-way valve, h...Capillary tube, ■...Pilot formula proportional valve. Figure 1 A-BB-C-A B -C-A B , A Figure 4 Figure 5 ■ Figure 6 ■ Figure 7

Claims (1)

[Claims] A main valve seat with a first main fluid passage opening on the bottom surface of the valve chamber, a first sub-valve seat with a first sub-fluid passage branched from the first main fluid passage opening on the top surface of the valve chamber, and a second main fluid passage on the side wall of the valve chamber. A main valve body having a passage opening and a main valve body that fits into the valve chamber like a piston to divide the valve chamber into a main valve chamber and a sub-valve chamber and close the main valve seat, and a sub-valve chamber. A second auxiliary valve seat provided with a second auxiliary fluid passage opening on the side that communicates with the main valve chamber side, and a first auxiliary valve body that can close the first auxiliary valve seat and between the main valve body. A second sub-valve body is provided on the main valve body side of the first sub-valve body and can close the second sub-valve seat. the valve body is biased toward the second sub-valve seat by a second spring provided between the valve body and the first sub-valve body, and the length of protrusion from the first sub-valve body is limited;
A pilot type proportional valve comprising: a valve drive rod capable of steplessly separating a first sub-valve element from a first sub-valve seat in accordance with rotation of a motor.